During this time, Montserrat was devastated by pyroclastic flows. S EC Water supplies were contaminated. In addition, regular passing storms from polar regions mixed with the ash to make the hazard even worse, creating lahars and river flooding as a result. S The volcano became famous, gradually boosted tourism popular with cruise ships. Sign up to Comment. Chile has got armed services however, and these would be instrumental in aid to the region, and Chile has a stable democratic government.

Volcanic bombs were hurled. People have returned to the island more recently. At this margin, clearly marked on the map and cross section opposite, there is oceanic to continental convergence. Chaiten is a small volcano in western Chile in the Andes fold mountains. Volcanic eruptions and lahars have destroyed large areas of Montserrat.

Impacts The towns of Chaiten and Futaleufu were evacuated.

The nature of the hazard type, magnitude, frequency This volcano has a history of eruptions but in human terms it is infrequent. It measures 16km long and 11 km wide. It is part of the Leeward Islands in a chain of islands known as the Lesser Antilles. The air pollution generated by the ash caused health problems for people.

The dome collapsed resulting in 5 million cubic metres of ash and dust pyroclastic flows in several directions enveloping the surrounding area. It’s split into 3 sections: About 4, people who lived there were evacuated by boat.

EC S D Population fell from 12, to 5, Long-term responses An exclusion zone was set up in the volcanic region.


Volcanoes and volcanic eruptions – Revision 6 – GCSE Geography – BBC Bitesize

Out migration – i n the people of Montserrat were granted full residency rights in the United Kingdom, allowing them to migrate if they chose. Before it had been dormant for over years. Studu channels became blocked too causing flooding. The major impact was on farming, and many farm animals were killed by suffocating on the ash.

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Once Chances Peak had woken up it then remained active for five years. At this margin, clearly marked on the map and cross section opposite, there is oceanic to continental convergence. Thus, it can be argued that prediction, preparation and prevention of this hazard were poor.

The volcano had been dormant for over years but started to erupt on the 18 th of July S EC Water supplies were contaminated. Volcanic bombs were hurled. The presence of the volcano resulted in a growth in adventure tourism. This is very low frequency!

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However, Chile is vulnerable to earthquake and volcanic events because of its tectonic setting at a subduction zone. There were s everal hundred domestic flights in Argentina and Chile and several dozen international flights from Santiago, Chile and Buenos Aires, Argentina cancelled.

Sign up to Comment. The Chilean Navy had managed to evacuate people initially and emergency measures included the following: Airports in Chile, Argentina and Uruguay, up to 2, km from the volcano, were forced to close or cancel flights. British citizenship was granted in In addition, volcanic ash from the eruption clouds caused ground transportation and health problems in Chile and Argentina.


The airport was buried by Lahars on 11 February Chile accepted aid and support from other South American countries and the wider world. The ash cloud could be seen from space and the volcano increased in size greatly due to lava deposition.

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These are the causes of this volcano, which is explosive because the lava is Rhyolitic, has high gas pressure and high Silica content. As the plate descends it causes earthquakes in the Benioff zone, and volcanoes occur here because of melting of the plate in the asthenosphere. EC S D houses completely destroyed. The airport was buried by Lahars on 11 February Short-term responses Large scale evacuation by the British Navy Abandonment of the capital city, Plymouth Compensation kevel redevelopment money donated by the UK government Unemployment rose due to the collapse of the tourist industry.

The Andes mountain chain has over 40 active volcanoes and in total, so this part of the world is vulnerable to this type of hazard.